Thermo Scientific STP-120 User manual

TISSUE PROCESSOR
STP-120
SERVICE MANUAL
Version 01/14

STP 120 Tissue Processor - Service Manual
Page 2
CONTENTS:
CERTIFICATION.......................................................................................................3
GUARANTEE............................................................................................................3
SAFETY.....................................................................................................................4
TECHNICAL DATA...................................................................................................5
TOOLS AND MATERIALS REQUIRED ...................................................................7
TROUBLESHOOTING..............................................................................................8
THE UNIT DOES NOT START...............................................................................8
NO DISPLAY....................................................................................................... 12
THE PARAFFIN BATHS DO NOT HEAT UP....................................................... 13
WARNING MESSAGES ON THE DISPLAY ......................................................... 15
REPLACEMENT OF COMPONENTS ................................................................... 25
BATTERY............................................................................................................ 25
FAN ..................................................................................................................... 25
ACTIVATED CHARCOAL FILTER...................................................................... 26
MAINS SWITCH.................................................................................................. 26
BATH CONNECTOR........................................................................................... 26
DISMANTLING THE UPPER PART.................................................................... 27
LOCATION OF COMPONENTS AND REFERENCE NUMBERS ........................ 30
SPARE PARTS LIST ............................................................................................. 34
APPENDIX ............................................................................................................. 36
WIRING DIAGRAMS........................................................................................... 36
ATTENTION
This manual is designed for the exclusive use of service technicians
with adequate training in carrying out mechanical and electrical
repairs.

Modular Inclusion Centre - Technical Information
CERTIFICATION The manufacturer certifies that this instrument has been carefully tested
and verified and that it complies with all applicable specifications before
being shipped from the factory.
The instrument complies with all applicable international safety standards.
GUARANTEE This product is guaranteed against all defects in material and workmanship
for a period of 1 (one) year. Any parts that are proven defective during this
guarantee period shall be repaired or replaced by the manufacturer free of
charge. No other guarantee is either specified or implied. Any unauthorised
changes, or repairs carried out by third parties shall make this guarantee
null and void.
The guarantee expires in the event of inadequate or erroneous use of the
instrument, or in the event that warning or cautionary messages are
ignored. The manufacturer assumes no responsibility for any damage that
may be caused, except in the case of manifest intent or extreme negligence
on the part of the manufacturer.
This manual is subject to modifications and changes without previous
notification.
One copy of this Service Manual is supplied with each instrument. Further
copies may be requested by indicating the version number, the number of
manuals required, the language (English, French or Spanish) and the date
of publication.

STP 120 Tissue Processor - Service Manual
Page 4
SAFETY
ATTENTION:
Please, observe the following general safety precautions when
operating this instrument.
Non-compliance with these instructions means that you are
invalidating the standards of safety and use for which this instrument
was designed.
The manufacturer shall not assume any responsibility for inadequate
use of the instrument or for any failure resulting from non-compliance
with basic safety requirements.
DANGER:
EARTH CONNECTION OF THE INSTRUMENT
The instrument should be connected to safety earth network to prevent any
injury caused by electrical shock. The instrument is fitted with a plug with
an earth terminal. The power supply should be connected to a safety earth
circuit and comply with the standards of the International Electrotechnical
Commission (IEC).
DANGER:
MAINS VOLTAGE
Do not remove the covers from the instrument while it is in operation. Any
replacement or adjustment of components should be only be carried out by
authorised trained maintenance staff. Disconnect the unit from the mains
power supply before opening or removing any covers.
DANGER:
RISK IN EXPLOSIVE ATMOSPHERES
The instrument should not be operated in any area where there is a risk of
explosion.
DANGER:
RISK OF RADIOACTIVE RADIATION
When working with radioactive specimens, all procedures applicable to
protection against radiation should be observed.
DANGER:
RISK OF INFECTION
Use appropriate safety and disinfection measures when working with
infectious specimens.






STP 120 Tissue Processor - Service Manual
Page 5
Technical Data
Type STP-120
EC Directives Refer to note on next page
Applicable Standards
Electromagnetic compatibility
Sizes
Diameter of the carrousel 850 mm
Height 500 – 700 mm
Diameter of the turning circle 670 mm
Weight
Including packing 145 kg
Net (fully equipped) 70 kg
Electrical installation
Rated Voltage (±10%) 100-120V ~ / 220-240 V ~
Frequency 50 – 60 Hz
Power consumption 400 VA
Fuses 115 V (2 x T4A)
230 V (2 x T2A)
Battery Nickel-Cadmium
(12V 600 mA)
IEC Classification 1010/EN61010-1
Degree of protection against electrical
shock. 1
Pollution class II
Noise < 70 dB
Capacity
Reagent stations
Number of reagent vessels 10 (9, if 3 are for paraffin.)
Volume per reagent vessel 1.8 L
Baskets for the specimen holders
Number of baskets 1 (option of 2)
Basket capacity 120 specimen holders
Paraffin stations
Number 2 (option of 3)
Volume 1.8 L
Rated Voltage 24 V ~
Rated power per station 100 VA
Temperature range 50 – 70 °C
Hysteresis margin 0.1 – 2 °C
Temperature cut-off 75 °C (± 4 °C)
Thermal protection Automatic reset

STP 120 Tissue Processor - Service Manual
Page 6
Programming
Number of programs 10 (selectable)
Programmable infiltration time per station from 1 s to 99 h 59 m
Rotation stirring selectable
Vertical shake selectable
Centrifugation selectable
Centrifugation time selectable
Program start delay selectable without time limit
Environmental conditions
Humidity max. 80% without condensation
Temperatures from 5 to 40 °C
Applied Directives and Standards:
Directives
73/73/CEE
Referring to the approximation of the legislation of the Member States on electrical
material destined for use within determined voltage limits
89/336/CEE
Referring to the approximation of the legislation of the Member States on
Electromagnetic Compatibility
Standards
Electrical Safety
UNE EN 61010-1(96)
+ A2 (96) + A2 Erratum (98)
Safety requirements for electrical equipment for measurement, control and laboratory
use. Part 1- general requirements.
UNE EN 61010-2-010 (96)
+ A1(97)
Safety requirements for electrical equipment for measurement, control and laboratory
use. Part 2- Particular requirements for laboratory equipment for the heating
materials.
UNE EN 61010-2-010 (99)
Safety requirements for electrical equipment for measurement, control and laboratory
use. Part 2-010: Particular requirements for automatic and semiautomatic analytical
equipment
Electromagnetic compatibility
EN 61326-1, 1997
Electrical equipment for measurement, control and laboratory use. EMC
requirements. Part 1: General requirements.
CISPR 22, 1993
Limits and methods of measurements of radio interference characteristics of
information technology equipment.
EN 55015, 1993
Limits and methods of measurements of radio interference characteristics of
household electrical appliances, portable tools and similar electrical apparatus.
IEC 1000-3-2, 1995
Electromagnetic compatibility (EMC). Part 3: Limits. Section 2: Limits for harmonic
current emissions (equipment input current £ 16 A per phase)
IEC 1000-3-3, 1995
Electromagnetic compatibility (EMC). Part 3: Limits. Section 3: Limits of voltage
fluctuation and flicker in low voltage supply systems for equipment with rated current
£ 16 A
IEC 1000-4-2, 1995
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 2: Electrostatic discharge immunity test. Basic EMC Publication
IEC 1000-4-3, 1995
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 3: Radiated, radio-frequency, electromagnetic immunity test. Basic EMC
Publication
IEC 1000-4-4, 1995
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 4: Electrical fast transients/ burst immunity. Basic EMC Publication
IEC 1000-4-5, 1995
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 5: Surge immunity test. Basic EMC Publication
IEC 1000-4-6, 1996
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 6: Immunity to conducted disturbances, induced by radio-frequency fields
IEC 1000-4-11, 1994
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 11: Voltage dips, short interruptions and voltage variations immunity tests.

STP 120 Tissue Processor - Service Manual
Page 7
Tools and materials
required Any maintenance work or adjustments to the STP 120 Tissue Processor
requires the use of the following tools and materials:
•Tester (Multimeter)
•Flat blade and Phillips screwdrivers (small and medium size)
•Allen keys in metric sizes.
•Small socket wrench in metric sizes
If it is necessary to replace temperature probes, apart from the
corresponding spare parts, the following items will also be required:
•Cyanoacrylate adhesive (e.g. Loctite, etc.)
•Silicone for semiconductors
•Standard neutral silicone
•Solvent and cutter
•Cable clamps (nylon/small)
•Sealed connection tags (for the paraffin baths)
Before taking any of the voltage readings, confirm the measurement points
by consulting the corresponding wiring diagrams included in this manual.

STP 120 Tissue Processor - Service Manual
Page 8
Troubleshooting
Problem:
THE UNIT DOES NOT START
Symptoms:
The 'POWER' LED does not light up.
1. Disconnect the unit from the mains power supply
2. Check the mains power supply cable.
3. Make sure that the mains voltage is the same as the voltage indicated in
the window beside the mains switch. Change the operating voltage by
inserting a screwdriver in the slot (see Figure). Open the fuse box
cover and invert the position of the red fuse holder as shown in the
diagram so that the correct voltage is displayed in the window.
Changing the
operating voltage
and fuse
replacement
Values of the fuses:
115 V →4 AT
230 V →2 AT
230 V
Check the power
supply fuses
Have they blown?
YES
Try to determine why the fuses blow.
Make sure there is no short-circuit.
Correct the fault.
Replace the fuses (115V/4AT or 230V/2AT), as described
above and go to the next step.
NO
Make sure that the fuse has been inserted correctly.
Make sure that the clips holding the fuse in the voltage
selector make good electrical contact with the fuse body. If
they do not make good contact, close them slightly.
Connect the unit to
the mains power
supply
Does it work
now?
YES
End of the procedure
NO
Any measurements made inside the unit first require
accessing the electronic system through the base. Proceed as
explained below to place the unit in an inclined position

STP 120 Tissue Processor - Service Manual
Page 9
Procedure for placing the
unit in position for
dismantling the base
1. Disconnect the unit from the mains power supply.
2. Activate the emergency battery:
- Turn the key switch located on the rear of the unit one
quarter turn to the right and hold it in position for about two
seconds.
- Return the key switch to the vertical position
3. Raise the cover of the unit by pressing the €key
4. Remove all the reagent vessels.
5. Remove the paraffin baths, but do not unplug the connectors to
prevent the control system from generating a message
indicating a temperature probe failure on start-up.
6. Lower the cover of the unit by pressing the €key
7. Place the unit in position for dismantling as shown in the
figure below and remove the lower front cover.
Dismantling position
$
ATTENTION: Before lifting the unit make sure that there is
sufficient space behind the unit to prevent the cover
bumping against any object if it needs to be raised.
Lift the unit by holding it at the base; never hold it by the
cover as this could cause irreparable damage.
Make sure that the round base of the unit is also firmly
supported by the table or workbench.
%
WARNING: Some of the following check procedures may
require connecting the unit to the mains power supply.
Exercise extreme care as some
components operate at mains
voltage.
Jig for holding the
unit in position for
dismantling
Make sure that the
unit is also
supported by the
edge of the round
base

STP 120 Tissue Processor - Service Manual
Page 10
8. Locate the resistance circuit board 1as shown in the figure below
Dismantling the
lower part
9. Connect the unit to the mains power supply.
10. Turn the switch to the ON position to power up the unit.
11. Use a multimeter (tester) to check that there is the same voltage as the
mains between terminals A and D on CON6 LINE IN of the resistance
circuit board (115V or 230V, as selected on the mains switch).
Measure the voltage
on resistance circuit
board CON 6 LINE IN
Is there voltage?
YES
Check whether there is the same mains voltage between
terminals A and D on CON6 TRF OUT of resistance circuit
board (115V or 230V, as selected on the mains switch).
NO
Turn off the unit. Disconnect the power supply cable. Replace
the lower cover and place the unit in a horizontal position.
Replace the mains switch with an identical make and model
as shown in the figure on page 26.
Once the mains switch has been replaced (fitted with a power
supply filter) turn the unit on and check whether it functions
correctly.
Resistance
circuit board
Resistance
circuit board
MICCAR V30
Circuit board
BASCAR V15
Circuit board
Ring
transformer
Front keypad
and display

STP 120 Tissue Processor - Service Manual
Page 11
Measure the voltage
on resistance circuit
board CON6 TRF
OUT
Is there
voltage?
YES
Check whether there is a voltage of 12 V on terminals 17 and 19 of
the BASCAR V15 circuit board (refer to page 10 and the wiring
diagram on page 37)
NO Disconnect the power supply cable and replace resistance circuit
board 1.
Connect the unit to the mains power supply and make sure that it
functions correctly.
Make sure there is a
voltage of 12 V
between terminals 17
and 19 of the
BASCAR V15 circuit
board
Is there
voltage?
YES
Disconnect the unit from the mains power supply.
Check fuse F1 on the BASCAR V15 circuit board (refer to page 10
and the wiring diagram on page 37)
NO Disconnect the unit from the mains power supply and replace the
ring transformer.
Connect the unit to the mains power supply and make sure that it
functions correctly.
Check fuse F1 on the
BASCAR V15 circuit
board
Blown?
YES Disconnect the unit from the power supply and replace fuse F1 on
the BASCAR V15 circuit board (access to this fuse requires
dismantling the MICCAR V30 circuit board).
Connect the unit to the mains power supply and make sure that it
functions correctly.
NO Disconnect the unit from the power supply and replace the BASCAR
V15 circuit board (access to this circuit board requires dismantling
the MICCAR V15 circuit board).
Connect the unit to the mains power supply and make sure that it
functions correctly.
Check correct
operation
Does it work?
YES Disconnect the unit from the mains power supply.
Replace the lower cover.
Place the unit in normal operating position.
End of the procedure
NO
Disconnect the unit from the mains power supply and replace the
MICCAR V15 circuit board.
Connect the unit to the mains power supply and make sure that it
functions correctly.
Check correct
operation
Does it work?
YES Disconnect the unit from the mains power supply.
Replace the lower cover.
Place the unit in normal operating position.
End of the procedure
NO
Disconnect the unit from the mains power supply and replace the
front keyboard and flat strips.
Check correct
operation
Does it work?
YES Disconnect the unit from the mains power supply.
Replace the lower cover.
Place the unit in normal operating position.
End of the procedure
NO
Go back to the beginning of the procedure and repeat all the steps.

STP 120 Tissue Processor - Service Manual
Page 12
Problem:
NO DISPLAY
Symptoms:
•The display does not light up or only black lines appear on the
front panel display
•Text or strange symbols appear on the display
•The display lights up but no text appears
Adjusting the contrast:
Adjust the contrast of the display by simultaneously pressing the UP
and DOWN keys for a few seconds.
If no text appears after this time, measurements should be taken
inside the unit
Measurements:
Any measurements made inside the unit first require accessing the
electronic system through the base. Proceed as described on pages
9 and 10 and place the unit in an inclined position.
Pay
close attention to the precautions described in ATTENTION
and WARNING
1. Disconnect the unit from the mains power supply
2. Make sure that the connectors of the flat connection strips
between the keyboard and the MICCAR V30 circuit board are
inserted correctly.
Check the flat strips
Are they inserted
correctly?
YES
Change the front keyboard and the flat strips between the
front keyboard and the MICCAR V30 circuit board
Connect the unit and make sure it operates correctly
NO
Make sure they are firmly pushed home.
Connect the unit and make sure it operates correctly
Check that the unit
functions correctly
Does it work?
YES
Disconnect the unit from the mains power supply.
Replace the cover lower.
Place the unit in normal operating position.
End of the procedure
NO
Disconnect the unit from the mains power supply.
Replace the MICCAR V30 circuit board
Connect the unit and make sure it operates correctly
If there is still no display, go back to the beginning and repeat
all the steps

STP 120 Tissue Processor - Service Manual
Page 13
THE PARAFFIN BATHS DO NOT HEAT UP
Possible causes
If one of the paraffin baths does not heat up this may be due to:
•Faulty paraffin bath:
- Heater
- Thermal circuit breaker
•Faulty BASCAR V15 circuit board
- Paraffin bath outlet fuses
- The BASCAR V15 circuit board
•Faulty MICCAR V30 circuit board
•Ring transformer
$
Before starting the unit using the switch on the rear, make sure that all
the connectors are inserted in the two paraffin baths (or three,
depending on the version), as the unit runs a check for the presence of
these signals on start-up.
Check by
elimination:
Before proceeding with any measurements, determine by elimination
whether the failure is the bath or the control electronics.
If, for example, the paraffin bath that does not heat is No. 12:
1. Turn off the unit
2. Invert the connectors to baths 11 and 12
3. Re-start the unit.
As the paraffin baths are identical, the origin of the failure can be determined
from the result for this test:
•If the paraffin bath that did not heat with connector 12 does not heat when
connected in position 11, the paraffin bath is very probably faulty
•If the paraffin bath that did not heat with connector 12 does heat up when
connected in position 11, the error is probably due to the control
electronics
Repairing the
paraffin bath
1. Dismantle the paraffin bath as shown in the figure on page 18
2. Check the continuity of the heater circuit and the thermal circuit breaker.
- If no current can flow through the thermal circuit breaker, replace it.
3. If there is no continuity in the heater circuit, because of the type and
shape of the heater (adhesive), ask your local distributor for a complete
aluminium bath fitted with heater, thermal circuit breaker and
temperature sensor.
Repairing the
control
electronics
1. Checking of the control electronics requires dismantling the lower front
cover as shown in the figures on pages 9 and 10.
2. Reconnect the paraffin baths
3. Connect the unit to the mains power supply
4. Make sure that the output voltage of the terminals on the BASCAR V15
circuit board is 24 V DC:
Outputs for the
heaters
Locating the input terminals of the circuit board and the output to the paraffin
baths, and the fuses for the heaters on the BASCAR V15 circuit board.

STP 120 Tissue Processor - Service Manual
Page 14
Paraffin bath
Output terminals
to the bath
Fuses (6.3AT)
Circuit board
input terminals
10 (optional)
9 - 10
F2
11 - 12
11
5 - 6
F4
7 - 8
12
1 - 2
F5
3 - 4
Check the output
voltage of the heaters
Is there an
output voltage?
YES
The fault is in the paraffin baths or the wiring between the
BASCAR V15 circuit board and the connectors on the rear of
the bath.
NO
If there is no voltage at the output, check the corresponding
fuse (see table above). If the fuse is blown replace it and
make certain that there is no short-circuit in the output
connector, the cable or the bath.
If there are no blown fuses, check the input voltage at the terminals of the
circuit board corresponding to each bath (see table above).
Check the input
voltage of the heaters
Is there an
input voltage?
YES
Replace the BASCAR V15 circuit board.
Check the correct operation of the unit
NO
Replace the ring transformer (refer to page 10)
Check correct operation

STP 120 Tissue Processor - Service Manual
Page 15
Warning messages
on the display
 
 
This message appears when the unit does not receive the signal that
the battery is fully charged or when the battery or the charging and
control system are defective.
NOTE: This message may appear on the screen when the unit is
connected for the first time. Press the ALARM key to acknowledge
reception of the alarm and operate the unit normally or leave it
connected. The battery should be fully charged to normal levels after
48 hours have elapsed.
If 48 hours have elapsed and after a cut in the power supply the
CHECK BATTERY message appears again the battery should be
replaced. Proceed as described in page 25
If the battery error message continues to appear after the battery has
been replaced, check fuses F6 and F7 on the BASCAR V15 circuit
board.
Procedure:
1. Connect the unit to the mains power supply
2. Turn the switch at the rear of the unit to the ON position.
3. Follow the procedure described on page 9
, skipping points 1 and 2.
4. After point 7 disconnect the unit from the power supply
5. Once the unit has been placed in position for dismantling first
remove the MICCAR V30 circuit board to gain access to fuses F6
and F7 on the BASCAR V15 circuit board.
Check fuses F6 and
F7 on the BASCAR
V15 circuit board
Are they blown?
YES
Replace the blown fuses on the BASCAR V15 circuit board.
F6 = 2AT; F7 = 125mAT
Reassemble the circuit boards
Connect the unit to the mains power supply and make sure that
it functions correctly.
NO
Replace the BASCAR V15 circuit board (access to this circuit
board requires first removing the MICCAR V30 circuit board).
Reassemble the circuit boards
Connect the unit to the mains power supply and make sure that it
functions correctly.

STP 120 Tissue Processor - Service Manual
Page 16
 
This alarm condition is produced when the unit detects a drop in the
mains voltage or whenever there is a failure in the power supply to the
electronic circuit boards.
Refer to point 3 on page 8 and make sure that the voltage shown is
correct.
Measurements:
Any measurements made inside the unit first require accessing the
electronic system through the base. Proceed as described on page 9,
skipping points 1 and 2 and place the unit in the inclined position.
Pay close attention to the precautions described in ATTENTION and
WARNING.
Procedure:
Take the same readings and perform the same operations as
described on page 10 as of point 9 to check:
•Resistance circuit board
•A voltage of 12V between terminals 17 and 19 of the BASCAR V15
circuit board
•Fuse F1 on the BASCAR V15 circuit board
If this procedure does not solve the problem, first replace the BASCAR
V15 circuit board and if the unit still does not function, replace the
MICCAR V30 circuit board

STP 120 Tissue Processor - Service Manual
Page 17
 
  
This message appears on the display when the unit does not detect a
signal from one of the temperature probes (sensors) in the paraffin
baths. (In the example, probe 11).

Before starting the unit using the switch on the rear, make sure
that all the connectors are inserted in the two paraffin baths (or
three, depending on the version), as the unit runs a check for the
presence of these signals on start-up.
Procedure:
1. Turn off the unit using the main ON/OFF switch
2. Insert the connectors for the paraffin baths in their corresponding
bases.
3. Turn the unit on using the main ON/OFF switch.
Once the self-check is completed, press the DOWN key to display the
temperature values of the different paraffin baths.
If any of these values is 280 °C, this could mean that there is a fault in:
•The temperature probe of the bath
•The BASCAR V15 circuit board
•The MICCAR V30 circuit board
Check by elimination:
Before proceeding with any measurements, determine by elimination
whether the failure is the bath or the control electronics.
If, for example, the error message indicates that it refers to probe 12,
proceed as follows:
1. Turn off the unit
2. Invert the connectors to baths 11 and 12
3. Re-start the unit.
As the paraffin baths are identical, the origin of the failure can be
determined from the message on the display:
•If the message still indicates that the error has occurred in probe 12,
it is very probable that the error is caused by the control electronics.
Refer to the procedure for placing the unit in dismantling position
(page 9) and replace the BASCAR V15 circuit board. If the unit still
fails to operate, replace the MICCAR V30 circuit board as described
on page 10.
•If the message now indicates that the error is in probe 11, it is
almost sure that the fault is in the temperature detector of the bath
that was previously bath 12.

STP 120 Tissue Processor - Service Manual
Page 18
Replace the
temperature probe
Before proceeding to replace the temperature probe make sure that the
following materials are available:
•Electronic temperature sensor, reference STP-059
•Cyanoacrylate adhesive (e.g. Loctite, etc.)
•Silicone for semiconductors
•Standard neutral silicone
•Solvent for cleaning
•Three sealed terminal clips
•Pliers for crimping the terminal tags
Dismantling the
paraffin bath
Procedure:
1. Remove the lower cover (three screws Phillips M3x5 and one
sheet metal screw) and remove the probe, cutting the silicone and
the three cables
2. Scrape off the silicone and adhesive using a cutter
3. Clean the surface with solvent and allow to dry
4. Place the new probe with the flat face in contact with the surface
(Refer to the figure ), and glue it in position using the cyanoacrylate
adhesive (use the adhesive with care, and follow the
manufacturer's instructions)
5. Once the adhesive has hardened, cover the area with
semiconductor silicone to increase the contact surface area.
6. Then cover the area around the probe with standard neutral
silicone to insulate the sensor from the environmental temperature.
7. Connect the cables of the new probe to the terminal tags making
sure that the colours are correct:
Brown -> Green
Red -> Yellow
Black -> Grey
8. Replace the cover.
9. Check the correct operation of the unit
Probe connection
cables
Thermal
circuit breaker
Flat
surface
Probe

STP 120 Tissue Processor - Service Manual
Page 19
Should the error persist, first replace the BASCAR V15 circuit board
and test the unit.
If the unit continues without correctly identifying the probe(s), replace
the MICCAR V30 circuit board.
When replacing the circuit boards, refer to the procedure for placing the
unit in position for dismantling on page 9 and the procedure for
replacing the circuit boards on page 10 and following.
 
 
This message appears when the
€
key on the control panel is pushed
to manually raise or lower the basket in a paraffin bath and the unit has
been under power for less than four hours.

In the event of a power failure lasting more than 7 (seven)
minutes, the unit automatically prevents any vertical movement of
the basket in the paraffin baths as there is a risk that the paraffin
has solidified.
If, under special circumstances, or for servicing, it is necessary to raise
or lower the basket when the unit is in blocked status, this
may be done
by proceeding as described below and bearing the following
precautions in mind:
•make sure that the paraffin bath is completely empty, or
•make sure that the paraffin is in its liquid state.

If these two conditions are not observed there is a very high risk
of causing serious damage to the unit
Procedure for
cancelling the solid
paraffin blocked status
1. Press the key ALARM to acknowledge reception of the alarm
message
2. Press and hold down the STOP key until READY appears on the
display.
3. Press the DOWN key to display the temperature of the paraffin
baths.
4. While the display is showing the temperature of the baths, and
before it disappears from the screen, simultaneously press the
ALARM and x2 keys.
An audible warning will sound and the baskets may be raised or
lowered for a period of 5 minutes. After these 5 minutes have
elapsed, the control will again enter blocked status until the time
period of 4 (four) hours has elapsed.
Remember that pressing the STOP key immediately stops any vertical
movement and that pressing the €key for a second time reverses the
direction of movement.

STP 120 Tissue Processor - Service Manual
Page 20
 
 
This alarm will appear in either of the following two cases:
1. If the
€
key is pressed while the program is running and the
basket remains out of the reagent recipients for more than 2 (two)
minutes, there is a risk that the samples will dry out.
This message, together with the audible warning, warns of this risk.
Cancel the alarm by pressing the ALARM key and lower the basket
using the €key.
2. If the unit has been programmed for a start delay and the basket
has not previously been lowered manually using the €key.
In this case there is also a risk of the samples drying out and the unit
issues a warning message and audible signal.
Press the ALARM key to acknowledge reception of the alarm, press
the €key to lower the basket and reprogram the start delay for the
unit (refer to the user manual).
 
 
This message appears if there is a malfunction of the RAM CLOCK
on the MICCAR V30 circuit board.
Before attempting to replace the RAM CLOCK, order a new one from
the manufacturer
Replacing the
RAM CLOCK
Replacement of the RAM CLOCK requires dismantling the
MICCAR V30 circuit board.
Refer to page 9 to place the unit in dismantling position.
Refer to page 10 and following to locate the MICCAR V30 circuit
board.
Once the RAM CLOCK has been replaced, reassemble the circuit
board, close the unit and place it in its operating position with the
baths connected.
Before reprogramming the unit, it must first be RESET to make sure it
accepts the new RAM CLOCK
Reset procedure
BEFORE connecting the start switch at the rear of the unit, press the
ALARM key. Hold the ALARM key down and use the On/Off switch to
connect the unit to the power supply and wait until the unit runs the
initial self-test.
Once the initial self-test is completed, release the ALARM key.
The unit has now been reset.

After resetting the unit all the user programs will have been
deleted and the parameters restored to their default values.
Refer to the user manual to re-enter the user defined programs
and parameters.